2 Pcs Yellow 1/2" Gear Dia 12 Teeth Metal Drill Chuck Key Item Name : Chuck Key;Pilot Diameter : 6mm /0.24" Gear Diameter : 13mm/1/2";Shank Diameter : 8mm /0.31" Overall Size : 82 x 45mm/ 3.2" x 1.8" (L*W);Teeth Number : 12 Color : Yellow, Black;Material : Plastic, Metal Weight : 92g;Package Content : 2 x Chuck Key